Self-adjusting clock-calendar



2 Sheets-Sheet 1'.

I; W. JOHNSON. Self'Adj'usting Clock Calendars. No. 230,134. Patented July 20,1880.

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' Sgglember. 1' i J c Thursda Inventor? jaaa 9 gamm 2 Sheets-Sheet 2. I. W. JOHNSON. Self Adjusting Clock Calendars. No. 230,134. Patented July 20.1880.

fizz/anion cfgzmza I UNITED I STATES PATENT OFFICE.

ISAAC W. JOHNSON, OF STRATFORD, NEW HAMPSHIRE.

SELF-ADJUSTING CLOCK-CALENDAR.

SPECIFICATION forming part of Letters Patent No. 230,134, dated July 20, 1880.

Application filed December 20, 1879.

To all whom it may concern:

Be it known that I, ISAAC WHITCHER JOHN- SON, of Stratford, in the county of Coos and State of New Hampshire, have invented certain new and useful Improvements in Self-Adjusting Perpetual Clock-Calendars and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The invention relates to clock-calendars arranged to be operated by a clock of ordinary construction.

The object of my invention is to provide a system of wheels,-levers,paw1s, ratchets, pins, cams, 850., actuated by an ordinary clock, for giving the day of the week, month, and day of the month perpetually, without manual adjustment after being once correctly adjusted.

The invention consists in the general arrangement of the whole, as hereinafter more fully described.

Figure 1 is a plan view of a device embodying my invention. Fig. 2 is a side elevation of the same as seen from the front of the clock. Fig. 3 is an end view of the yearly disk and leap-year device. Fig. 4 is a vertical transverse section of the same, showing those parts to the right of the line no 00, Fig. 1. Fig. 5 is a vertical transverse section of the same, showing those parts to the left of the line y 3 Fig. 1. Fig. (Sis a vertical transverse section of the same, showing those parts to the right of the line 2 2, Fig. l; and Figs. 7, 8, and 9 are detail views of the yearly disk, weekly ratchet-and-stop mechanism, and day-of-themonth cylinder, respectively.

Ais the base; 13, the yearly disk O, the day-of-the-month cylinder; D, the monthly cylinder, and E the weekly cylinder.

The day-of-the-month cylinder 0 is mounted on a shaft, F, which carries at the other end a ratchet-wheel, Gr, operated by a spring-pawl, H, and lever I,which operates the calendar by means of a rod, J, connecting with the hourhand shaft of a clock of ordinary construction. This lever also actuates, by means of a rod, K, made adjustable by means of the screw a, the rock-shaft L, which serves at one end, by means of the hook I), as a stop for the dayof-the-month cylinder (1, and at the other as a rest-hook, d, for the yearly disk B, which carries the leap year cam M and slide 0. Said cam is provided with pins 0, of which there are four, and at each revolution of the disk B is moved one fourth of a revolution by means of the stud f, Fig. 3. It will thus be seen that the cam M makes a revolution on its own axis once in four years, and, by projecting the slide 0 flush with the projections g at the proper time, serves to increase the face of the said projections q, for the purpose and as hereinafter more fully set forth. The shaft F also carries a cam, g, which, revolving once a month, at each revolution elevates a lever, 70, to which is pivoted a gravity-pawl, It, Fig. 6,which engages with and operates the twelvetoothed ratchet-wheel secured to the monthly cylinder d. When the pawl it drops it advances the cylinder D one month, the stopt' preventing it from being advanced farther than required.

The adjustable disk 0 carries a pin, 1, on one side, near the periphery, which operates a vertical lever, m, projecting from the rockshaft P, which also carries a vertical hooked wire, a, which engages with one of twelve slots in the disk 0, mounted on the shaft R.

The ratchet-wheel Gis provided on one side with a pin, 1), which, at each revolution of the said wheel, moves the disk 0 one-twelfth of a revolution. The hooked wire it releases the disk 0 as the pin 1) upon the wheel G engages with the said disk 0.

At points corresponding to the 28, 29, and 30 day months (February, April, June, September, and November) there are projections g on the periphery of the disk B, which prevent the stop-hook Z), by means of the shaft L and hook cl, from engaging with the pins 4' on the end of the cylinder 0, thus permitting the lever I and'pawl H to drop lower and revolve the cylinder O at once one, two, three, or four days, according to the length of the face of the projections g on the disk 13.

The leap-year cam M, during the other years, sustains a sliding projection, 0, Figs. 3 and 7, the outer end of which is held flush with the projections q. A spring, 8, withdraws the slide 0 when the cam M is in the proper position, which will give twentynine days for February in leap-year.

The Weekly cylinder E is actuated by means of a weighted lever, t,.l ig. 8, operated by a pin from lever I, and having pivoted thereto a gravity-pawl, a, which engages with the ratchetwvheel w, of seven teeth, attached to the shaft of the said cylinder. A stop-hook, o, prevents the cylinder from being revolved too far.

Having thus described my invention, I claim as new and desire to secure by Letters Pat ent- 1. The combination of the yearly disk 13 with the leap-year cam M, having pins 0, the slide 0, and pin f, all operating substantially as set forth.

2. The combination of the disk I5, provided with projections q thereon, with the hook (I, rock-shaft L, and hook I), for the purpose substantially as shown.

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3. The combination of the shaft L and rod K with the screw a and lever I, substantially as described.

4. In combination with the shaft F, carrying at one end the day-of the-month cylinder C, the adjustable disk 0, carrying pin 1, for operating rock-shaft P by means of the rod m, substantially as shown.

5. In combination with the shaft P, the hook n, for engaging with the disk 0, secured to the shaft R, substantially as set forth.

6. The shaft R, carrying the disk 0 at one end and the disk B at the other, in combination with rock-shaft P, hook it, arm m, and pin 1, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand and seal this 17th day of November, 1579.

ISAAC WIII'llCllER JOHNSON. [L.

Witnesses REUBEN B. MARDEN, ISAAC SPILLER. 

